Scanning tunneling microscopy studies in the heavy fermion system with even and odd hybridization

Publication date: Available online 21 January 2019Source: Physics Letters AAuthor(s): Fu-Bin YangAbstractThe effect of even and odd hybridization for scanning-tunneling microscopy process in the heavy fermion system is studied by the nonequilibrium Green function method. It is found that an even hybridization leads to symmetric density of states (DOS), while an odd hybridization leads to the vanishing of the DOS of the nondiagonal term. Besides, the differential conductance under the even hybridization is the natural consequence of the existence of van Hove singularities. In the odd hybridization situation, the differential conductance reflects the interference between normal tunneling and cotunneling is absent in the simplest tunneling models. The results obtained provide valuable theoretical guidance to the heavy fermion (HF) experiments.

Source: Physics Letters A - January 22, 2019 Category: Physics Source Type: research